Slim-type fan structure

Abstract

A slim-type fan structure includes a stator ( 1 ) and a fan blade ( 2 ). The stator includes a circuit board ( 11 ) and a plurality of layout circuits ( 12 ) disposed to circumference the circuit board ( 11 ). The stator ( 1 ) includes an axial center ( 10 ) at a center portion thereof. The fan blade ( 2 ) includes a blade wheel ( 20 ), an axial sleeve ( 21 ) at a center of the blade wheel ( 20 ) and extended axially therefrom, a plurality of blades ( 22 ) formed to circumference an outer of the blade wheel ( 20 ), and a magnetic unit ( 23 ) disposed on the blade wheel ( 20 ). Also, the axial sleeve ( 21 ) is pivotally attached to the axial center ( 10 ). Accordingly, the magnetic unit ( 23 ) is formed by a plurality of N and S pole areas ( 230 ), ( 231 ) arranged alternatively in circular rows and corresponding to the layout circuits ( 12 ) along a vertical direction for the slim design.

What is claimed is: 
     
       1. A slim-type fan structure comprising:
 a stator ( 1 ) comprising a circuit board ( 11 ) and a plurality of layout circuits ( 12 ) disposed to circumference the circuit board ( 11 ); the stator ( 1 ) having an axial center ( 10 ) at a center portion thereof; 
 a fan blade ( 2 ) comprising a blade wheel ( 20 ), an axial sleeve ( 21 ) arranged at a center of the blade wheel ( 20 ) and extended axially therefrom, a plurality of blades ( 22 ) circumference an outer of the blade wheel ( 20 ) to form a concaved space, and a magnetic unit ( 23 ) fittedly disposed inside the concaved space on the blade wheel ( 20 ); and the axial sleeve ( 21 ) configured to pivotally attach to the axial center ( 10 ); and 
 a fan shield ( 3 ) covering an outer of the fan blade ( 2 ); the fan shield ( 3 ) having a fixation portion ( 300 ) provided to secure the axial center ( 10 ); 
 wherein the magnetic unit ( 23 ) is formed by a plurality of N pole areas ( 230 ) and a plurality of S pole areas ( 231 ) arranged alternatively in circular rows and arranged corresponding to the plurality of layout circuits ( 12 ) along a vertical direction in order to achieve the slim-type fan structure, 
 wherein the blade wheel ( 20 ) of the fan blade ( 2 ) further includes a fixation hole ( 200 ) at a center portion thereof, and the axial sleeve ( 21 ) includes a fixation edge ( 210 ) inserted into the fixation hole ( 200 ), and the fixation edge ( 210 ) further forms a plurality of insertion members ( 211 ) circumferencing an outer thereof, and an outer surface of the fixation hole ( 200 ) further form a plurality of insertion slots ( 201 ) with dimensions corresponding to the plurality of insertion members, and 
 wherein when the plurality of insertion members ( 211 ) are fitted into the plurality of insertion slots, a side of each insertion member ( 211 ) away from the stator ( 1 ) is coplanar to a side of the blade wheel ( 20 ) away from the stator ( 1 ). 
 
     
     
       2. The slim-type fan structure according to  claim 1 , wherein the magnetic unit ( 23 ) of the fan blade ( 2 ) is manufactured by mixing a magnetic material with a material of the fan blade ( 2 ) in order to integrally form the fan blade ( 2 ). 
     
     
       3. The slim-type fan structure according to  claim 2 , wherein the magnetic material is a magnetic power. 
     
     
       4. The slim-type fan structure according to  claim 3 , wherein the magnetic material is distributed throughout the blade wheel ( 20 ) opposite from the stator ( 1 ). 
     
     
       5. The slim-type fan structure according to  claim 1 , wherein the fan shield ( 3 ) comprises a base ( 30 ) and a shield cover ( 31 ); the base ( 30 ) includes a fixation portion ( 300 ) for securing the stator ( 1 ); the base ( 30 ) includes a first air opening ( 301 ) formed on one side thereof; the shield cover ( 31 ) covers onto the base ( 30 ) and includes a second air opening ( 310 ) opposite from the fan blade ( 2 ). 
     
     
       6. The slim-type fan structure according to  claim 5 , wherein the first and second air openings ( 301 ), ( 310 ) are an air inlet and an air outlet respectively.